Question: Which G-type main sequence star has the maximum stellar rotational velocity?
Paraphrase: Which G-type important sequence celebrity has the most stellar rotational velocity?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q5864 . ?ent wdt:P4296 ?obj . ?ent wdt:P31 wd:Q5864 } ORDER BY DESC(?obj)LIMIT 5 
Answer: U Ophiuchi, HD 200391, V505 Sgr, AF Lep, U Ophiuchi